Police step up hunt for serial bomber in Texas

A manhunt is underway for a serial bomber the US city of Austin.

Earlier a device exploded in the residential area of the Texas capital - the fourth such explosion in a month.

Police say there are similarities between the latest device and three previous package bombs.

Reporter Steve Mort says officials fear whoever is behind the bombings may try to strike again.

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ALT: Reporter Steve Mort says police believe they are looking for a someone with a detailed knowledge of explosives.

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